Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1993-06-09
1994-01-11
Messinger, Michael
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250226, G01J 120, G01J 350
Patent
active
052784029
ABSTRACT:
An optical dispersion sensor for sensing optical dispersion introduced by the atmosphere in near real-time and an optical system using the dispersion sensor to compensate for atmospheric dispersion are described. The input signal to the dispersion sensor is the image of the scene being viewed by a scanning optical system. The image of the scene is passed through an aperture near the image plane of the optical system and then onto at least two individual light detecting systems. One of the detecting systems is adapted to detect light of a first wavelength band. The other detecting system detects light of a second wavelength band. The sensor computes the relative time delay between the signals derived from the two detecting systems. The time delay indicates the spectral dispersion introduced by the atmosphere. In an optical system, a control circuit adjusts a variable dispersive element contained within the optical system to compensate for the atmospheric dispersion by driving the relative time delay between signals towards zero.
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Litton Systems
Messinger Michael
Wallach Michael H.
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